THE INHIBITING ACTION 23 



17 to Apr. 5. The anthocyanin is indicated by stippling. In 

 both leaves the anthocyanin goes into the new shoots, collecting 

 in that part of the leaf where the notches give rise to new growth. 

 These results then establish the principle that when the growth 

 of shoots and roots is accelerated in certain notches of a leaf the 

 sap from the whole leaf has a tendency to flow to these notches, 

 as a consequence of which the growth in the other notches is 

 inhibited. We shall see later that this principle not only holds 

 for regeneration in the leaf but also in the stem. 



